[SR-Users] directed media problem when video is included in sdp

[Juha Heinanen]

when sems receives voice call invite from ua behind nat that has
direction:active in its sdp, like this:

        Session Description Protocol
            Session Description Protocol Version (v): 0
            Owner/Creator, Session Id (o): foo.bar 0 0 IN IP4 192.168.1.
68
            Session Name (s): -
            Connection Information (c): IN IP4 192.168.1.68
            Time Description, active time (t): 0 0
            Media Description, name and address (m): audio 8500 RTP/AVP 18 4 112 100 101 0 8 106
            Media Attribute (a): sendrecv
            Media Attribute (a): rtpmap:18 G729/8000
            Media Attribute (a): rtpmap:4 G723/8000
            Media Attribute (a): rtpmap:112 AMR/8000
            Media Attribute (a): rtpmap:100 EG711U/8000
            Media Attribute (a): rtpmap:101 EG711A/8000
            Media Attribute (a): rtpmap:0 PCMU/8000
            Media Attribute (a): rtpmap:8 PCMA/8000
            Media Attribute (a): rtpmap:106 telephone-event/8000
            Media Attribute (a): direction:active

sems includes direction:passive in 200 OK and starts to correctly send
rtp packets to the ip address/port of received rtp packets.

however, then sems receives a voice+video call invite like this:

        Session Description Protocol
            Session Description Protocol Version (v): 0
            Owner/Creator, Session Id (o): foo.bar 0 0 IN IP4 192.168.1.68
            Session Name (s): -
            Connection Information (c): IN IP4 192.168.1.68
            Time Description, active time (t): 0 0
            Media Description, name and address (m): audio 8500 RTP/AVP 18 4 112 100 101 0 8 106
            Media Attribute (a): sendrecv
            Media Attribute (a): rtpmap:18 G729/8000
            Media Attribute (a): rtpmap:4 G723/8000
            Media Attribute (a): rtpmap:112 AMR/8000
            Media Attribute (a): rtpmap:100 EG711U/8000
            Media Attribute (a): rtpmap:101 EG711A/8000
            Media Attribute (a): rtpmap:0 PCMU/8000
            Media Attribute (a): rtpmap:8 PCMA/8000
            Media Attribute (a): rtpmap:106 telephone-event/8000
            Media Description, name and address (m): video 8600 RTP/AVP 34
            Bandwidth Information (b): AS:300
            Media Attribute (a): sendrecv
            Media Attribute (a): rtpmap:34 H263/90000
            Media Attribute (a): direction:active

it does not include direction:passive in 200 OK and keeps on sending rtp
packets to 192.168.1.68 even after receiving first voice rtp packet from
public ip of the ua.

is this a bug in sems or is it a bug in sr nathelper_k
fix_nated_sdp("1") implementation, i.e., does that function place
direction:active line to only one place, when it should place it in two
places (in both voice and video media descriptions)?

-- juha